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. <br /> Area C: <br /> 10-Yr. 25-Yr. 100-Yr. <br /> Existing Conditions 2 cfs 3 cfs 6 cfs <br /> Proposed Developed Conditions 4 cfs 5 cfs 9 cfs <br /> With the assumption of the SCS CN 58 for existing conditions, our calculations indicate an <br /> increase in peak flows from existing conditions to proposed conditions. It is our <br /> recommendation that stormwater detention ponds be constructed to reduce the proposed condition <br /> peak flow rates down to the existing condition peak flow rates. <br /> The following is the recommended approximate size of the detention volume needed for each <br /> drainage area (using the 100-yr. storm event peak flow rates): <br /> Area A: Reduce 83 cfs to 52 cfs <br /> Approximate storage volume = 1.4 Ac. Ft. <br /> Area B: Reduce 60 cfs to 37 cfs <br /> Approximate storage volume = 1.0 Ac. Ft. <br /> Area C: Reduce 9 cfs to 6 cfs <br /> Approximate storage volume = 0.1 Ac. Ft. <br /> The location of the actual detention ponds will be determined during the engineering design <br /> phase of the project. <br /> -111-Q- TR SS Ftioqi y57 SA6Gts - RfPRoa► 14 t1 6G Pril Es <br /> ARE F 6FD . <br /> bev-t <br /> g /3/ ? 7 <br />